/Engine/Plugins/Runtime/MeshModelingToolset/Source/ModelingComponents/Public/Changes/MeshPolygroupChange.h
FDynamicMeshGroupEditBuilderbuilds up aFDynamicMeshGroupEditincrementally.
class FDynamicMeshGroupEditBuilder
TUniquePtr<FDy...
Edit
TPimplPtr<UE::...
PolygroupSet
TMap< int32, in...
SavedIndexMap